Abstract: With the informatization requirement of metal mine enterprises, Metal Mine ERP is dsigned. Based on the analysis of the design object, system modules, the key factors are emphasized. Firstly, the business process is unstable, so the component composition technology based on workflow should be used to design the system architecture. Secondly, ore grade is important in the whole produce process, so the analysis and evaluation model of ore grade should be built to study the relationship of the ore grade in different period. Thirdly, cost analysis is the core part to enterprise management, so the multi-dimensional model should be built to control the production cost.